Audi announced today that it has received remarkable results with its best-selling A4 model, achieving an average fuel-consumption of just 4.4 liters of diesel per 100 km (53.46 US mpg), with CO2 emissions of 115 grams per km (185.07 g/mile).

The models are powered by a 2.0-liter TDI engine delivering 100 kW (136 hp) and 320 Nm (236.02 lb-ft) of torque, the latter of which is available between 1,750 and 2,500 rpm.

Still, the cars deliver average performances: the sedan can accelerate from zero to 100 km/h (62.14 mph) in 9.5 seconds, while the top speed is limited to 215 km/h (133.59 mph); the Avant model can sprint to 100 km/h (62.14 mph) in 9.8 seconds and a top speed of 208 km/h (129.25 mph).

In order to achieve these performances, the all the gear ratios of their six-speed manual transmissions were lengthened slightly, while the forged 16-inch alloy wheels are wrapped in 206/60 tires that have been optimized with respect to rolling resistance.

Both models are offered in the Attraction trim line, and the Audi A4 2.0 TDI (100 kW 115 g CO2/km) has a base price of €31,600, while the Avant model starts at €33,250.

Audi is further improving the efficiency of its models. Starting immediately, two new versions of the best-selling A4 that consume less fuel than ever are available in Germany. The sedan consumes just 4.4 liters of diesel per 100 km (53.46 US mpg) on average, with CO2 emissions of 115 grams per km (185.07 g/mile). These same figures for the A4 Avant are 4.6 liters (51.13 US mpg) and 120 grams (193.12). CO2 emissions have been reduced by four and nine grams, respectively, compared with the previous models.

Efficiency at Audi does not come at the expense of sportiness. The new models have powerful engines. Their two-liter TDI generates 100 kW (136 hp) and 320 Nm (236.02 lb-ft) of torque, the latter of which is available between 1,750 and 2,500 rpm. The sedan accelerates from zero to 100 km/h (62.14 mph) in 9.5 seconds on its way to a top speed of 215 km/h (133.59 mph); the Avant completes the standard sprint in 9.8 seconds and reaches 208 km/h (129.25 mph).

The two new A4 models use the technologies from Audi's modular efficiency platform. All the gear ratios of their six-speed manual transmissions were lengthened slightly, and the forged 16-inch alloy wheels are shod with 206/60 tires that have been optimized with respect to rolling resistance. Aerodynamic tweaks to the body and a lower ride height improves the drag coefficient, while the on-board computer with efficiency program gives the driver tips about when to shift and on fuel-efficient driving.

Audi offers the two new efficiency top models in the A4 series in the Attraction trim line. The Audi A4 2.0 TDI (100 kW 115 g CO2/km) has a base price of €31,600; prices for the A4 Avant 2.0 TDI (100 kW 120 g CO2/km) start at €33,250.